Mattress



FIG. 1 is a front, right and top perspective view of a mattress, showingmy design.

FIG. 2 is a rear, left and bottom perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

FIG. 9 is a cross-sectional view of the mattress of FIG. 1 , taken alongsection line 9-9 as depicted in FIG. 7 .

CLAIM The ornamental design for a mattress, as shown and described.